abb. YLOD. A light that is displayed when the PlayStation 3 games console experiences total hardware failure of any kind. The system then turns itself off and cannot be turned back on again without fixing the system.
This is typically attributed to either the CPU or the GPU failing due to bad soldering methods. This mainly occurs with launch PS3s, but some newer PS3s have known to have 'gone' YLOD as well.
It is very similar to the Red Ring of Death experienced by the Xbox 360 games console.
Fixing a YLOD is not easy and is costly most of the time.